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Date:   Fri, 31 May 2019 01:42:02 +0200 (CEST)
From:   Jiri Kosina <jikos@kernel.org>
To:     Josh Poimboeuf <jpoimboe@redhat.com>
cc:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        the arch/x86 maintainers <x86@kernel.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Pavel Machek <pavel@ucw.cz>, Ingo Molnar <mingo@redhat.com>,
        Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Linux PM <linux-pm@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4] x86/power: Fix 'nosmt' vs. hibernation triple fault
 during resume
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On Thu, 30 May 2019, Josh Poimboeuf wrote:

> > >     Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
> > 
> > Yes, it is, thanks!
> 
> I still think changing monitor/mwait to use a fixmap address would be a
> much cleaner way to fix this.  I can try to work up a patch tomorrow.

I disagree with that from the backwards compatibility point of view.

I personally am quite frequently using differnet combinations of 
resumer/resumee kernels, and I've never been biten by it so far. I'd guess 
I am not the only one.
Fixmap sort of breaks that invariant.

Thanks,

-- 
Jiri Kosina
SUSE Labs